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JOURNAL ONLINE OF PHYSICS
Published by Universitas Jambi
ISSN : -     EISSN : 25022016     DOI : -
Core Subject : Science,
Jurnal Online of Physics muncul sebagai wadah publikasi ilmiah dibidang fisika murni dan fisika terapan. Jurnal ini terbit secara online dua kali setahun yaitu pada bulan Juni dan Desember. Jurnal ini di terbitkan oleh program Studi Fisika Fakultas Sains dan Teknologi Universitas Jambi.
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Articles 41 Documents
STUDI AWAL PENGEMBANGAN PAPAN KOMPOSIT BERBASIS LIMBAH PELEPAH SAWIT SEBAGAI MATERIAL AKUSTIK Yuliza, Elfi; Ekawita, Riska
JOURNAL ONLINE OF PHYSICS Vol 5 No 1 (2019): Jurnal Fisika Vol 5 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v5i1.8254

Abstract

Pada penelitian ini dikembangkan papan komposit berbasis limbah sawit berupa pelepah sawit. Dengan karakteristik material berpori yang dimiliki, papan komposit berbasis limbah sawit berpotensi dikembangkan sebagai material akustik. Untuk menghasilkan papan komposit, limbah pelepah sawit dikeringkan pada suhu 105 oC selama 24 jam dan kemudian dihancurkan untuk mendapatkan serbuk pelepah sawit. Tahap selanjutnya adalah pembuatan papan dengan menggunakan perekat PVAc sebagai matrik dan serbuk pelepah sawit sebagai filler. Pengujian akustik dilakukan menggunakan perangkat lunak Audacity dengan variasi frekuensi suara 100 Hz-500 Hz dengan kenaikan 100 Hz.  Hasil pengujian menunjukan kemampuan papan komposit untuk meredam/menyerap bunyi dengan baik. Lebih lanjut, papan komposit berbasis pelepah sawit menunjukan peforma yang baik untuk pengujian frekuensi yang lebih besar. Pada penelitian ini juga dilakukan komparasi peforma peredaman bunyi dari papan komposit dan papan yang digunakan secara komersial.
ANALISIS PARAMETER SUMBER SPEKTRAL GEMPABUMI VTA (VULKANO TEKTONIK-A) TERHADAP AKTIVITAS VULKANIK GUNUNG SINABUNG Kusmita, Tri; Brotopuspito, Kirbani; Triastuty, Hetty
JOURNAL ONLINE OF PHYSICS Vol 5 No 1 (2019): Jurnal Fisika Vol 5 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v5i1.8267

Abstract

The source parameters describe the different physical properties of seismic volumes under the volcanoes. Source parameters that can be used to distinguish seismic events that are generated by different types of volcanoes activities. Temporary changes of the spectral source parameters provided a description of the main events during the eruption process.  Source parameters are calculated by correlating the relationship between source frequency at spectral displacement (corner frequency) and source parameters based on spectral sources of the Brune model (1970). The angular frequency obtained by applying the FFT algorithm to the VTA spectral displacement. The source parameters analyzed from this VTA earthquake are the spectral slope, seismic moment, stress drop, length of rupture, moment magnitude and radiation energy. Based on the obtained corner frequency (12 Hz-13 Hz), seismic moment, moment magnitude and energy radiation respectively were at 0.2 -1.9 x 1012 Nm, 0.7 - 2 Mw, and 0.1 - 9.5 x 1015 erg. The length of rupture were from 144.2 to 243.1 m, the spectra slope has 2.1 - 7.8 dB/cm, and stress drop are 0.1 - 7,6 bar. From the results of this study, it can be concluded that the changes of spectra characteristic and fluctuate of source patrameters value of VTA earthquakes was asosiated with the different  volcanic activity of Sinabung. Keywords: spectral, VTA, source parameter, volcanic earthquake
APPLICATION OF PIT HEAT METHOD IN SANGGAI MACHINE TECHNOLOGY AS A ORGANIC PRESERVATIVE OF FOOD Martino, Dede; Ardiyaningsih Puji Lestari; Linda Handayani
JOURNAL ONLINE OF PHYSICS Vol 5 No 1 (2019): Jurnal Fisika Vol 5 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v5i1.8268

Abstract

Indonesia is a country that has extraordinary natural resources, both biological and non-biological natural resources. Indonesia has a great opportunity in utilizing natural resources to improve the welfare of the people. Unfortunately, Indonesia has not been yet able to exploit all of that. The prices of agricultural products are quite high but ironically the welfare of farmers has not improved either. On the other hand, other natural resources from the marine and earth sector also have export potential, but in fact these potentials have not had a significant influence. One of the causes of the suboptimal use of natural resources in Indonesia is the lack of integration of technology in developing the potential of the biodiversity. One of the efforts made to optimize the potential for life is to apply the concept of physics, which uses the concept of pit heat in the ?sanggai? engine technology. This machine can be used to optimize the potential of agriculture in Indonesia. Pit heat technology can dry food without damaging the vitamin content. This technology does not damage the protein structure of food substances so that the application of technology on this machine can be used to optimize the potential of agriculture in Indonesia.
A COMPREHENSIVE STUDY ON THE MICROSTRUCTURE AND OPTICAL PROPERTIES OF FE3O4 NANOPARTICLES BY VARIATION OF TEMPERATURE AND NAOH CONCENTRATION Indrayana, I Putu Tedy
JOURNAL ONLINE OF PHYSICS Vol 5 No 1 (2019): Jurnal Fisika Vol 5 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v5i1.8166

Abstract

This work was aimed at optimizing the microstructure and optical properties of Fe3O4 by variation of synthesis temperature and NaOH concentration. The nanoparticles have been synthesized from iron sand by using the coprecipitation method. The temperature was varied of 60oC, 80oC, and 100oC, while NaOH concentration was 3 molar, 5 molar, and 7 molars. The microstructural parameters were characterized by using X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) techniques. The optical properties were characterized by using Fourier Transform Infrared Spectroscopy (FTIR) and UV-Vis Spectroscopy, consecutively. The results showed that the crystallite size of Fe3O4 increase with an increase of synthesis temperature due to higher thermal energy driving the nucleation process. The crystallite sizes are in the range of 3.77 nm ? 20.37 nm. Increasing NaOH concentration also affected the increase in crystallite sizes. On the other hand, an excess of NaOH concentration influences the formation of smaller crystallite sizes of Fe3O4 with smaller crystal density and larger microstrain. The existence of Fe2+-O and Fe3+-O vibration in FTIR spectra confirmed the formation of Fe3O4 nanoparticles. The direct and indirect optical gap energies of Fe3O4 were in the range of 3.15 eV ? 3.39 eV and 2.39 eV ? 2.91eV. The synthesis temperature and NaOH concentration have a significant role in controlling the properties of Fe3O4.  
ANALISIS KARAKTERISASI XRD SINTESIS GADOLINIUM KARBONAT (GD2(CO3)3@PEG DENGAN METODE SOLVOTERMAL Nasution, Erika Linda Yani
JOURNAL ONLINE OF PHYSICS Vol 5 No 1 (2019): Jurnal Fisika Vol 5 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v5i1.8213

Abstract

Abstrak Telah dilakukan sintesis partikel pegilasi gadolinium karbonat dengan metode solvotermal menggunakan prekursor polietilen glikol (PEG-1000) dan gadolinium asetat hidrat (Gd(CH3CO3)3) pada suhu 180oC dengan waktu pemanasan selama 3 jam, 5 jam, dan 7 Jam. Partikel pegilasi gadolinium karbonat (Gd2(CO3)3@PEG tersebut selanjutnya dianalisis pola difraksi dan bentuk struktur dengan menggunakan X-Ray Diffraction (XRD). Hasil karakterisasi spektrum XRD terhadap partikel Gd2(CO3)3 menunjukkan pila difraksi dengan posisi puncak-puncak difraksi bersesuaian dengan JCPDS No. 37-0559 dengan puncak utama pada 2? = 11.75o.  Pada waktu  pemanasan 3 jam , sampel memiliki sifat amorf, sedangkan pada sampel waktu pemanasan 5 jam dan 7 jam sampel-sampel memiliki derajat kekristalan yang baik. Pada waktu pemanasan 5 jam lebih tinggi kristalisasinya daripada 7 jam yang mengindikasikan kualitas kristal lebih baik pada lama pemanasan 5 jam.   Kata kunci : Gadolinium karbonat, metode solvotermal, PEG, XRD   Abstract   [Title: Analysis of XRD Characterization of Gadolinium Carbonate (Gd2 (CO3) 3 @ PEG Synthesis by Solvothermal Method] Synthesis of pegylated gadolinium carbonate particles by solvothermal method using polyethylene glycol (PEG-1000) and gadolinium acetate hydrate (Gd (CH3CO3) 3) precursors at 180oC with heating time for 3 hours, 5 hours and 7 hours. The gadolinium carbonate (Gd2 (CO3) 3 @ PEG particle pegylation was further analyzed by diffraction patterns and structural shapes using X-Ray Diffraction (XRD). The results of XRD spectrum characterization of Gd2 (CO3) 3 particles showed diffraction pila with diffraction peaks position. corresponds to JCPDS No. 37-0559 with the main peak at 2? = 11.75 o At 3 hours of heating, the sample has amorphous properties, while the sample heating time is 5 hours and 7 hours the samples have a good degree of crystallization. 5 hours higher crystallization than 7 hours which indicates better crystal quality at 5 hours heating time.   Keywords: Gadolinium carbonate, solvothermal method, PEG, XRD
PENERAPAN LOGIKA FUZZY PADA SISTEM KELAYAKAN TANAH SAWAH BERDASARKAN PH DAN SUHU TANAH -, Susilawati
JOURNAL ONLINE OF PHYSICS Vol 5 No 1 (2019): Jurnal Fisika Vol 5 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v5i1.8216

Abstract

Salah satu faktor yang dapat mempengaruhi pertumbuhan padi adalah tingkat kesuburan tanah. Semakin tinggi tingkat kesuburan tanah, maka keberhasilan budidaya padi akan semakin meningkat. Walaupun demikian, terdapat beberapa faktor penyebab rendahnya produktivitas tanaman padi. Namun, diantara beberapa faktor tersebut, suhu dan pH merupakan dua faktor utama penyebab kegagalan budidaya padi. Hal ini disebabkan karena suhu sangat berpengaruh terdapat pertumbuhan hama, sedangkan pH berfungsi agar unsur hara dalam tanah dapat dengan mudah diserap oleh tanaman padi. Oleh karena itu, penelitian bertujuan untuk menginvestigasi kelayakan kondisi tanah sawah untuk budidaya padi. Untuk medapatkan hasil analisis yang akurat, proses identifikasi kondisi tanah dilakukan dengan bantuan teknologi microcontroller dan sensor, yaitu sensor DS18B20 untuk mengukur suhu dan sensor pH tanah. Kemudian untuk menginvestigasi kondisi tanah, data suhu dan pH yang diperoleh diintegrasi dan dikalkulasi menggonakan kosep logika fuzzy. Hasil penelitian ini menunjukan bahwa sensor yang diterapkan dapat menginterpretasikan kondisi suhu dan pH tanah sesuai dengan kondisi nyata dengan tingkat akurasi sebesar ±96%. Selain itu, logika fuzzy yang diterapkan juga dapat digunakan untuk mengklasifikasikan kondisi tanah sawah ke dalam kategori tidak baik, kurang baik, dan baik. Kata Kunci: kesuburan tanah, microcontroller, sensor, fuzzy
RANCANG BANGUN ALAT MONITORING AIR BERBASIS MIKROKONTROLER DENGAN SENSOR KUALITAS AIR Nadi, Muhammad Rizki Gorbyandi Nadi
JOURNAL ONLINE OF PHYSICS Vol 5 No 1 (2019): Jurnal Fisika Vol 5 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v5i1.8245

Abstract

Air merupakan salah satu factor  siklus kehidupan. Air harus dilindungi dan dilestarikan dari semua jenis polutan. Minimnya akses air bersih untuk konsumsi di Indonesia menjadi pembunuh sunyi karena banyak orang yang meninggal dari berbagai penyakit yang timbul buruknya kualitas air yang tidak diketahui oleh masyarakat khususnya pedesaan di Indonesia. Berdasarkan Rencana Pembangunan Jangka Menengah Nasional (RPJMN), pemerintah menargetkan cakupan pelayanan air bersih sanitasi yang layak mencapai 100 persen pada 2019. Tetapi, faktanya kurangnya alat monitoring kualitas air yang tersedia menjadi kendala di berbagai sumber mata air. Maka dari itu perlu adanya alat monitoring air yang bisa digunakan secara efektif. Alat monitoring kualitas air memiliki sensor yang mendeteksi parameter seperti temperatur, pH, oksigen terlarut (DisolvedOxigen, DO) dan konduktivitas dalam air. Dalam penelitian ini dilakukan perancangan dan pembuatan sistem monitoring air dengan sensor kualitas air. Alat yang dibuat berupa sistem elektronik yang dilengkapi dengan mikrokontroler, sensor kualitas air dan display. Alat ini dapat digunakan dengan akurasi data, konsistensi data, dan durability-nya  yang tinggi terhadap pengukuran kualitas air.   Kata kunci : Kualitas Air, Mikrokontroler, pH, Dissolved oxygen (DO), Konduktivitas
PENINGKATAN SENSITIVITAS SENSOR KOIL DATAR MEMPERGUNAKAN SOFT MAGNETIC VITROVAC Emrinaldi, Tengku; Defrianto; Fiddunya, Sultan Fiddunya; N. Setiadi, Rahmondia; Umar, Lazuardi
JOURNAL ONLINE OF PHYSICS Vol 5 No 1 (2019): Jurnal Fisika Vol 5 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v5i1.7986

Abstract

This study reports the design of non-magnetic plate thickness sensors based on Eddy Current principld in the form of flat coils. The principle used in the Eddy Current sensor is a change of mutual coil inductance due to the presence of objects in the magnetic field. The coil is made up of single and double layer coil designed using Corel Draw Software based on printed circuit board (PCB) material with dimensions of 152.4 mm x 101.6 mm, which has a track distance of 0.125 m. Single and double layer coil inductance evaluations are carried out using the EVB  LDC 1000 L/V Converter module which converts plate thickness into inductance values. The addition of a 30 mm Vitrovac thin film mounted in the direction of the winding in the 2 mm diameter coil core has been carried out to increase the sensitivity value of the sensor which gives an increase in sensitivity value of S = 0.321 uH / mm or 33.2%. The coil is able to measure plate thickness up to 10mm well.
RANCANG BANGUN SISTEM PENANGKAP DAN PEMBACAAN GELOMBANG SEISMIK REFRAKSI UNTUK EKSPLORASI HIDROKARBON Maison, Maison; Farid, Faizar; Samsidar; Handayani, Linda; Rustan; Pebrilia, Jesi; Amri, Iful
JOURNAL ONLINE OF PHYSICS Vol 5 No 1 (2019): Jurnal Fisika Vol 5 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v5i1.8115

Abstract

The subsurface data acquisition in seismic eksploration usually using expensive equipment. In this work, a low-cost seismic equipment system has been developed for receive and record seismic wave. This system consist of mikrocontroller and software LabView that connected to PC. The subsurface low signals is recorded by geophone and through the amplifier instrument non-inverting. Then, the digital signals is prosessed by Mikrocontroller and visualize by LabView. Output of seismic measurement using this system design are travel time and amplitude. Travel time is used to modelling density and wave velocity to generate wave model. The expected model can give us value of density and wave velocity to obtain the anomaly. It has been tested using 1 geophone and successfully showed the wave, amplitude, and travel time.
SIMULASI KERUNTUHAN BENDUNGAN BILI-BILI KABUPATEN GOWA PROVINSI SULAWESI SELATAN rustan; Irpan Chumaedi; Handayani, Linda
JOURNAL ONLINE OF PHYSICS Vol 5 No 1 (2019): Jurnal Fisika Vol 5 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v5i1.8117

Abstract

The extreme weather that occurred on January 22-24, 2019 in the Makassar city and surrounding areas caused massive flooding in the downstream area of ??the Bili-Bili DAM which covered 5 districts and cities, namely Gowa Regency, Makassar City, Jeneponto Regency, Maros Regency, and Selayar Regency. There 6757 people were displaced and tens of hectares of rice fields and housing were inundated. As a form of evaluation in the context of disaster mitigation efforts if similar or larger events occur in the future, it is very important to do a floods simulation to mapping which areas will be affected by flood inundation if the Bili-Bili DAM collapses. The software used to simulate flooding in this study is HEC-RAS 2D. The object of research is focused in the city of Makassar which is a densely populated city center and other vital objects. The parameters analyzed are the distribution of flood inundation area and the depth of flood inundation. Simulation results that have been calibrated will be used as a reference for disaster mitigation planning.